Average Weather For St. George's, Grenada

Location

This report describes the typical weather at the Maurice Bishop International Airport (St. George's, Grenada) weather station over the course of an average year. It is based on the historical records from 1991 to 2012. Earlier records are either unavailable or unreliable.

St. George's has a tropical rainforest climate with no dry season. The area within 25 mi of this station is covered by oceans and seas (94%) and grasslands (5%).

Temperature

Over the course of a year, the temperature typically varies from 75°F to 87°F and is rarely below 72°F or above 90°F.

Daily High and Low Temperature

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

The warm season lasts from August 18 to October 27 with an average daily high temperature above 87°F. The hottest day of the year is September 13, with an average high of 87°F and low of 79°F.

The cold season lasts from December 31 to March 13 with an average daily high temperature below 85°F. The coldest day of the year is January 25, with an average low of 75°F and high of 84°F.

Fraction of Time Spent in Various Temperature Bands

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

The length of the day does not vary substantially over the course of the year, staying within 51 minutes of 12 hours throughout. The shortest day is December 21 with 11:25 hours of daylight; the longest day is June 20 with 12:51 hours of daylight.

Daily Hours of Daylight and Twilight

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

The earliest sunrise is at 5:41am on June 1 and the latest sunset is at 6:36pm on July 9. The latest sunrise is at 6:33am on January 25 and the earliest sunset is at 5:39pm on November 19.

Daylight saving time (DST) is not observed in 2012.

Daily Sunrise & Sunset with Twilight

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Clouds

The median cloud cover ranges from 43% (partly cloudy) to 63% (partly cloudy). The sky is cloudiest on June 12 and clearest on January 25. The clearer part of the year begins around August 8. The cloudier part of the year begins around April 6.

Median Cloud Cover

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

On January 25, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 65% of the time, and overcast or mostly cloudy 20% of the time.

On June 12, the cloudiest day of the year, the sky is overcast, mostly cloudy, or partly cloudy 62% of the time, and clear or mostly clear 24% of the time.

Cloud Cover Types

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

The probability that precipitation will be observed at this location varies throughout the year. Precipitation is most likely around July 14, occurring in 72% of days. Precipitation is least likely around April 13, occurring in 40% of days.

Probability of Precipitation at Some Point in the Day

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

Over the entire year, the most common forms of precipitation are moderate rain, light rain, and thunderstorms.

Moderate rain is the most severe precipitation observed during 54% of those days with precipitation. It is most likely around June 30, when it is observed during 42% of all days.

Light rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around February 6, when it is observed during 23% of all days.

Thunderstorms are the most severe precipitation observed during 11% of those days with precipitation. They are most likely around September 17, when it is observed during 18% of all days.

Types of Precipitation Throughout the Year

Relative frequency of various types of precipitation over the course of a typical year.

During the warm season, which lasts from August 18 to October 27, there is a 60% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate rain (44% of days with precipitation have at worst moderate rain), thunderstorms (27%), and light rain (25%).

During the cold season, which lasts from December 31 to March 13, there is a 55% average chance that precipitation will be observed at some point during a given day. When precipitation does occur it is most often in the form of moderate rain (58% of days with precipitation have at worst moderate rain) and light rain (39%).

Warm Season Precipitation

Cold Season Precipitation

Relative frequency of various types of precipitation during the warm and cold seasons respectively.

Snow

Either snow is exceptionally unlikely to fall at any time during the year at this location or this station does not reliably report precipitation types.

Humidity

The relative humidity typically ranges from 64% (mildly humid) to 95% (very humid) over the course of the year, rarely dropping below 57% (mildly humid) and reaching as high as 100% (very humid).

The air is driest around February 27, at which time the relative humidity drops below 68% (mildly humid) three days out of four; it is most humid around November 15, exceeding 92% (very humid) three days out of four.

Relative Humidity

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.

Over the course of a year, the dew point typically varies from 69°F (muggy) to 79°F (oppressive) and is rarely below 66°F (muggy) or above 81°F (very oppressive).

Dew Point

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

Over the course of the year typical wind speeds vary from 1 mph to 19 mph (light air to fresh breeze), rarely exceeding 24 mph (fresh breeze).

The highest average wind speed of 14 mph (moderate breeze) occurs around May 31, at which time the average daily maximum wind speed is 19 mph (fresh breeze).

The lowest average wind speed of 9 mph (gentle breeze) occurs around October 26, at which time the average daily maximum wind speed is 16 mph (moderate breeze).

Wind Speed

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the east (55% of the time) and south east (11% of the time). The wind is least often out of the south west (0% of the time), west (0% of the time), north west (0% of the time), north (1% of the time), and south (1% of the time).

Wind Directions Over the Entire Year

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.